Deburring and polishing apparatus



May 17, 1949.

E. E. cooK ET AL 2,470,340

DEBURRING AND POLISHING APPARATUS Filed July 15, 1946 a M @El 3Sheets-Sheet l May 17, 1949. E. E. COOK ET AL DEBURRING AND POLISHINGAPPARATUS 5 Sheets-Sheet 2 Filed July l5, 1946 uw, MM, uw, w ki May 17,1949. E. E. cooK ET AL 2,470,340

DEBURRING AND POLISHING APPARATUS Filed July l5, 1946 5 Sheets-Sheet 3Patented May 17, 1949 DEBURRIN G AND POLISHING APPARATUS Ernest E. Cookand Harry J. Sadler, Minneapolis,

Minn., assignors to Almco, Incorporated, Minneapolis, Minn., acorporation of Minnesotal Application July 15, 1946, Serial No. 683,596

3 Claims.

Our invention relates to cooperating apparatus for deburring andpolishing metallic pieces and the like and, generally stated, comprisesa novel tumbler, a novel hoisting structure for elevating material to betumbled and abrasive material to the tumbler, and a novel screening andtransporting structure.

The primary object of our invention is to produce novel apparatus of thetype generally above described, which is rugged in construction,relatively inexpensive to manufacture, which will occupy a relativelysmall space and which will greatly facilitate the plurality ofoperations required in the deburring of metallic pieces and the like.

The above and numerous other objects and advantages of our inventionwill become apparent from the following detailed specification, appendedclaims and attached drawings.

Referring to the drawings in which like characters indicate like partsthroughout the several views:

Fig. 1 is a perspective view illustrating one of the phases of operationof our combined appare.- tus;

Fig. 2 is a perspective view of my improved apparatus illustrating adifferent phase of operation;

Fig. 3 is a front elevation of a hoisting mechanisrn, some parts beingbroken away;

Fig. 4 is a perspective view of the mechanism shown in Fig. 3,illustrating a different position of some of the parts, some parts beingremoved;

Fig. 5 is a horizontal section taken on the line 5 5 of Fig. 3; and

Fig. 6 is a side elevation of the screen of our.

apparatus.

Referring with greater particularity to the drawings, the numeral Iindicates a horizontallydisposed tumbler frame, which, preferably, andas shown, is generally rectangular in form. Journallcd for rotation on ahorizontal axis by means of bearings 2, (only one of which is shown) isa tumbler drum 3 having a peripheral opening 4 which is normally coveredby a hatch, (not shown) fastened by means of a locking mechanismidentified in its entirety by the numeral 5.'

The bearings 2 are fastened to the sides of the frame I. Depending fromthe corners of rectangular frame I are supporting legs 6, oppositeVpairs of which are tied together intermediate their ends byvertically-spaced tie-bars 1. Tumbler frame I, supporting legs 6 andtie-bars I cooperate to form a forwardly-opening tunnel beneath the drum3 and transversely of the axis thereof.

The tumbler drum 3 is connected to a shaft 8 which is adapted to bedriven from a motor 9 through connections including a motor driven beltI 0, a pulley I I and gears within a gear housing I2. The drivingmechanism as shown is secured to and supported by one of the tie-bars 1.

A hood identified in its entirety by the numeral I3 is made up of astationary cover element I4 and a hinged cover element I5, which, asshown in Figs. 1 and 2, is in its open position. The electric motor 9 iscontrolled by a conventional off- Manipulation of the switch I6 permitsthe drum to be stopped with the and-on switch I 6.

we use a hoise and a hoist pan indicated in theirv entireties by thenumerals I'I and I8, respectively, see particularly Figs. 1, 3 and 4.The hoist pan I8 is in the nature of a rectangular open-topped boxhaving vertical sidewalls I9, sloping end portions 20 and a flat bottom2l. hoist pan I8 is open and hooded to form a delivery spout 22 for thedischarge of materials therefrom. At its delivery end, the hoist pan I8is equipped with a wheel 23 journalled in a swivelled bearing 24, and atits other end the hoist pan I8 is provided with a pair of Wheels 25journalled in bearings 26, fast on the hoist pan I8. A centrally-locatedtransverse hoisting bar 27 is secured at its ends to the sidewalls I9 ofthe hoist pan I8, preferably forward of the center of gravity of thehoist pan I8.

The hoist I'I comprises a hoist mechanism 28, a hoist mechanismsupporting element 29 laterally projecting from the closed end portionof a vertically-disposed inverted U-shaped hoist frame member 3D, ahorizontally-disposed U- shaped hoist frame member 3| and a brace member32. The hoist mechanism 28 may be of any of the commercial type ofself-contained motor- One end of thedriven units and is suspended fromthe supporting element 29 by a ring bolt or the like 33. A hook 34,carried by a sheave 35, is raised and lowered by means of a cable 36that is wound on a drum, not shown, but which is contained in the hoistmechanism 28. The brace member 32 is actually an extension of thesupport element 29 and is welded or otherwise secured to theintermediate portion of the closed end of the horizontally-disposedU-shaped hoist frame member 3|.

Referring to Fig. 1, it will be seen that the hoist I1 carriesanfoperating switch 31 mounted on a. bracket 38 which, in turn, issecured to the brace member 32. The switch 31 is connected to the motorof the hoist mechanism 28 by means off' wires within cables 39 andelectricaltcurrent is supplied to the motor through a cable 4D. The legs(indicated by the numeral 413' offthe' vertically-disposed hoist framemember 3U at theirv extreme lower ends are welded' or'otherwisesecuredto the intermediate portion' of legs-42- of the horizontally-disposedU-shaped hoist frame member 3|. As shown, the hoist frame elements- 29,30, 3l and 32 are constructed of steel tubing or the like 'an'dthecomposite :structure isof' a very rigidandrsturdynature. Aftrits openend;

the horizontal frame'member 31| fis 'sufficiently` wi'defito 'receiveTthe .hoist pan' 1:8'. which' is conn-'ected to the: :hooks .34.orraising' 'and lowering 'by means of a bail 43, the central portionwof.

tenedto the -ends :of frame member 3.1, .and a pair of wheels 46.'journalle'd' in 'bearings 41 ,pir-- otally mountedon'zthe f closed fends of'frame. member 3|. As shown :in Fig. 1, a .handle 48 is pivote'dvat 49- to -the-brace vmember 32 for moving the hoist H to ldiierentfstations rsuch xas tumbler mechanism yor .a storage bin' -forthe abrasive material.

It Awill be noted byreierence Vto Fig.. 1-, that when loading material:into-1 the tumbler drum 3 a portion of the rhoist'frame member f31l,inamely the open end' thereof, :extends tinto the. tunnel formed .by the:frame -I',..legs 'E Aand tief-bars Tof the tumbler trame mechanismbelow the drum 3.. Itbecomes' obviousfrom the foregoing that with `sucha. tunnel-like arrangement rof the tumbler `framefstructure it is.not'necessary :to use a conventional hoist -frame with .an overhanging'boom tand the necessarily attendant counter-weighted. base.

fFor automatically tilting "the :hoist 'pan.. ;I.8 'to pour 'materialvinto. :the rdrum, we provide ya cable yI! .of 'predetermined lengthwhich is secured at one -end-.to thehoistframemember 3i', asiat 5I,'andhooked at its-other end, adjacent the spout end of the hoist, asfatf 52.When,vun der lifting 'operation of theihoist mechanism l23, the hoist.pan IH3 is araised to 'a-predetermined level, th'e-cableprevents.thespoutend. from ascending further,` and icontinued .raising of '-the,holst` pan I8 Aby vthe-hoist mechanism -28 causes the :hoist -pan d8 totilt forward suiciently --to discharge itsy f contents :intothewdrlnn`i3 through the-peripheral `opening 4.

During the tumbling operation, the opening 4 is necessarily closed by acover, not shown, and the hinged cover element I5 of the hood I3 ismoved to a position wherein at least the entire upper half of the drum 3is concealed. 0f course, prior to the closing of the tumbler drum 3,closing of the hood I3, and starting the motor 9, the hoist I1 and hoistpan I8 are removed from their positions at Fig. 1.

When the tumbling operation has been completed, it becomes necessary todischarge the contents from the tumbler drum 3 and separate thework-piecesfrom the' abras/ive material. This important function isaccomplished rin a manner and by apparatus now to be described.

A screen 53 is mounted for oscillatory movements on aAsubstantially-rectangular screen frame 54 comprising side-bars 55, arear end -bar :56, and an inverted U-shaped handle bar 51, which at itsfree ends is extended to form a pair ofv legs 58. A second pair of legs59 depend from` the rear corners of the screen frame 54. The 'legs '5'9"terminate in bearings 60 with wheels 6I jonrnalled therein. A pair oflongitudinal tie-bars 62 (only one of which is shown) conneet one reachlof legs A5,9,-adjacentythe bottom ends thereof. To. further strengthenthe screen frame .54, .we provide va transverse tie-bar 6.3

based intermediate .the closedend of the handlei bar 51 .and the screen53. IIhe screen .53 is suspended, adjacent its frontend, from `the frame54, by a pair of hanger bars 64 pvoted `to the.

screen at 65.- and. to the Atrame .54 at 6,6. Adjacentits rear end,.thescreen53 is ,pivoted to .one

6,8; and at its lower .end-.is Apivotally secured to the end of pitmanarrn 1U which is driven from au` electric motor 1I mounted on the rearend of the screenfframe54. .A.beltv1.42 runsoyer apulley 1-3 .on theshaftof fthe motor 1I and a .pulley A1.4

journalled on .the rear end of the screen frame- 54. A crank. .15 .underthe pulley L4 is pivotally connected to and drives the pitman arm 1U tothereby oscillate the screen v53. (see particularly Fig. 6).

Electrical .current vis supplied to the motor 1I through wires in acable 16 at the end of which a plug 11 engages a socket 'I8 mountedbetween spaced tie-bars `1 on the tumblerapparatus. vA control' switchv19 for the .motor ,1.I. is .also mount,- ed between said tie-bars 1adjacent the tumbler motor control switch .I 6.

It will be noted that thescreenframe 54, legs 58 and 5.9, tie-bars .6,2and screen 53.c0mbine to form.a.forward1yopening vtunnel into which theyhoistpan L8 .is,adapted` to be .received (see Fig. 2).. Itxwillbefurtherseenby reference to Figs. 2 and 6 that the screen 53 slantsin adownward direction from the rear end ofthescreen unit to the front endthereof.

During. thetumbling operation and subsequent toremovalofthe hoist I1from its positionin front of the tumbler drum.3, the screening unit. isyWheeled .into vplace in the tunnel .formed by tumbler frame 4l, legs I5`and tie-bars 1, directly below. the opening 4f of -the tumbler drum 3.The hoist pan I8.is then placedin the tunnel formed by the screen framel 54 and its associated parts. A-similar hoistpan I8 orany othercontainer such as shown .by dotted linesand indicated by the numeralmay.l then beplaced on the oor below the front endof the; screen 53v(see Fig. 6). Thev plugfll is then insertedinto thesocket 1,8. .When

the tumbling operation is completed, the screen 53 is put into operationby manipulation of the control switch 19 and the cover removed from theopening 4 in the tumbler drum 3. The drum 3 is rotated until the opening4 is at the bottom thereof, and the contents discharged into the screen`53 through which the pieces of abrasive material fall into the hoistpan I8 under the screen 53. The finished work pieces tail over theforward end of the screen 53 into the container 80 which may then beremoved. The hoist I 1 may then be used for recharging the tumbler drum3 with the abrasive material from the hoist pan I8 or the material maybe dumped into a storage bin, not shown.

While we have shown a preferred embodiment of our invention herein, itwill be understood that this apparatus may be modied Without departingfrom the scope of the appended claims.

What we claim is:

l. A hoisting mechanism comprising, a horizontally-disposedforwardly-opening U-shaped hoist frame member, a vertically-disposedinverted U-shaped hoist frame member connected at its base to theopposite sides of the horizontal hoist frame member intermediate theends thereof, a hoist-supporting element secured to the upper portion ofsaid vertical hoist frame member and projecting forwardly intermediatethe sides thereof, a hoist detachably secured to and depending from saidhoist-supporting element, hook means carried by said hoist, a portablehoist pan adapted to pass between the side members of saidhorizontally-disposed U-shaped hoist frame member, a centrally-locatedtransverse 3.

hoisting bar on said hoisting pan, a bail on said hoisting bar adaptedto be engaged by the hook means carried by the hoist, and a cablesecured at one end to the front end of the hoist pan and at its otherend to the closed end of the horizontally-disposed hoist frame member,said cable being of a length to tilt the hoist pan forwardly to dump itscontents when said hoist pan has been elevated to a predeterminedposition.

2. The structure dened in claim 1 in further combination with a bracemember secured to the closed end of said U-shaped horizontally-disposedhoist frame member and projecting upwardly and forwardly to the closedend of the vertically-disposed hoist frame member and terminating insaid hoist-supporting element.

3. The structure dened in claim 1 in which the forward end of said hoistpan is provided at one end with a delivery spout.

ERNEST E. COOK. HARRY J. SADLER.

REFERENCES CITED The following references are of record in the le ofthis patent:

UNITED STATES PATENTS Number Name Date 1,266,569 Eggleston May 21, 19181,450,950 Jenkins Apr. 10, 1923 2,101,196 Ransoho" Dec. 7, 19372,131,771 Turnbull Oct. 4, 1938 2,387,693 Trevino Oct. 23, 19452,419,813 Berchtold Apr. 29, 1947 FOREIGN PATENTS Number Country Date519,836- Germany Mar. 5, 1931v

